<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- <el-cascader v-model="value" :options="options" :props="{ expandTrigger: 'hover' }" @change="handleChange"></el-cascader> -->
              <el-cascader :options="catelist" v-model="addForm.goods_cat" :props="cateProps" @change="handleChange" clearable ref="elcascader" @visible-change="elCascaderOnlick" @expand-change="elCascaderOnlick">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <!-- 每循环一次就拿到一个名称cb -->
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.atte_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到的后台API地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 父文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览弹框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <span>
        <img :src="previewPath" alt="" class="previewImg">
      </span>
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //这是商品所属的分类数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品的详情描述
        goods_introduce: '',
        attrs:[]
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ],
      },
      //商品分类列表
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        checkStrictly: 'true',
        expandTrigger: 'hover',
      },
      //动态参数列表数据
      manyTableData: [],
      //静态属性列表数据
      onlyTableData: [],
      //上传图片的URL地址
      uploadURL: `http://127.0.0.1:8888/api/private/v1/upload`,
      //这个是图片上传组件的headers请求头对象(不设置这个对象，
      //upload组件就不会用到我们定义的axios而是用了塔自己封装的Ajax)
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get(`categories`)
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    //级联选择器选中项变化，会触发这个函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      //证明选中的不是三级分类
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat.length = []
        return this.$message.error('只允许为选择第三级分类')
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开的标签页是：'+ oldActiveName);
      // console.log('即将进入的标签页是：'+ activeName);
      // //阻止标签页的切换
      // return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked() {
      //证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        console.log(res.data)
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        //证明访问的是静态属性面板
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      console.log(file)
      //1.先获取将要删除的图片的临时路径
      const filePath = file.response.data.tem_path
      //2.从pics数组中找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex((x) => {
        x.pic === filePath
      })
      //3.调用数组的splice方法，把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response)
      //1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      //2.将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    //添加商品
    add() {
      //添加商品前的预验证
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        //验证通过，执行添加的业务逻辑
        //这里根据接口文档1.8.2将goods_cat数组转换成字符串，但是级联选择器要求goods_cat是数组
        //解决办法：转成字符串之前先将goods_cat深拷贝一份出来
        //lodash cloneDeep(obj)
        //这里form和addForm是两个完全不相干的对象
        //addForm只供给级联选择器进行双向数据绑定，转字符串直接操纵form就行了
        const form = _.cloneDeep(this.addForm)
        form.goods_cat=form.goods_cat.join(',')
        //接口文档要求addForm里面有一个attrs数组，其中只包含attr_id和attr_value两项，所以要进行以下操作
        //处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form);

        //发起请求添加商品
        //商品的名称必须是唯一的
        const {data:res} = await this.$http.post(`goods`,form)
        if(res.meta.status!==201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push(`/goods`)
      })
    },

    //设置自动收起级联选择框
    elCascaderOnlick() {
      let that = this
      setTimeout(function () {
        document.querySelectorAll('.el-cascader-node__label').forEach((el) => {
          el.onclick = function () {
            this.previousElementSibling.click()
            that.$refs.elcascader.dropDownVisible = false
          }
        })
        document
          .querySelectorAll('.el-cascader-panel .el-radio')
          .forEach((el) => {
            el.onclick = function () {
              that.$refs.elcascader.dropDownVisible = false
            }
          })
      }, 10)
    },
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
